Carbon Arc Lamps

c. 1857-used in lighthouses
1877-1950s streetlights
Still found in some film projectors.

-----Original Message-----
From: HISTORICAL ARCHAEOLOGY [mailto:[log in to unmask]]On Behalf Of Ron
May
Sent: Friday, October 28, 2005 3:03 AM
To: [log in to unmask]
Subject: Re: Old Flashlight batteries


Archaeological investigations of a burned 1916-1919 United States Army
building at Fort Rosecrans, San Diego, California (CA-SDI-12,000) exposed a
number
of carbon rods of various sizes. Although some were undoubtedly from
batteries, other larger ones were associated with search lights used for
coast
artillery sighting. I too have wondered how those were made and how long the
technology has been around.

Ron May
Legacy 106, Inc.